Frequency sensitivity of sub-excitable systems coupled with different topology

• 来源期刊: 中国物理（英文版）
• 关键词: frequency sensitivity coupled systems stochastic resonance scale-free network small world network FitzHugh-Nagumo
• 年，卷（期）: 2004,（4）
• 页码范围: 448-453
• 页数: 6页
• 语种: 英文

摘要

We have investigated numerically the behaviours of identical FitzHugh-Nagumo systems, which are coupled into topologies of regular one-dimensional lattice, small-world network and scale-free network, and driven by white noise and an external signal. We found that when a number of uniform systems are coupled into a network, the system's signal-to-noise ratio remains at a high level in a wider frequency range than in the case of a single oscillator. Different architectures manifest different impact, with the scale-free network being the most remarkable. Results presented here suggest a possible approach to improve the sensitivity of a system to external signals and are helpful for designing communication equipments.